Socket for electric lamps.



W. G. LINDEMANN.

SOCKET FOR ELECTRIC LAMPS.

APPLICATION FILED FEB.20,1909.

Patented July 6, 1909.

UNI ED STATES WILLIAM G. LINDEMANN, OF MILWAUKEE, WISCONSIN.

SOCKET FOR ELECTRIC LAMPS.

To all whom it may concern:

Be it known that I, WILLIAM G. LINDE- MANN, a citizen of the United States, residing at Milwaukee, in the county of Milwaukee and State of Wisconsin, have invented a new and useful Socket for Electric Lamps, of which the following is a specification.

' My invention relates to improvements in lamp sockets for electric lamps, and pertains especially to that class of sockets employed in what are known as husk chandeliers.

The object of my invention is to provide a form of construction in which the lamp and cord plug may be removed without disengaging the shade, the casing being integrally formed or struck up from a single piece of metal.

My invention also has for its object certain structural improvements hereinafter more particularly described and claimed.

In the following description, reference is had to the accompanying drawings, in which Figure 1 is an elevation of my improved lamp socket with the lamp in position. Fig. 2 is a vertical sectional view of the socket and plug. Fig. 3 is a view of the same as seen from the upper side. Fig. 4 is, a detail of the screw threaded insulated bushing.

Like parts are identified by the same reference characters throughout the several views.

'T he casing A is integrally formed or pressed from a single iece of sheet metal and provided with a tliimble B, which receives the insulated cap nut C, through which the cords D pass. The body of the casing A is preferably in the form of an inverted cup with an annular head a near the lower margin or open end, and below this bead the marginal portion of the casing is pressed or creased to form screw threads a. These threads being formed by pressing or creasing the sheet metal composing the casing, it is obvious that both the interior and exterior surface is threaded. A shade holder E, preferably also formed of sheet metal, is provided with a threaded portion e, which engages the exterior surface of the screw threads 0 on the casing A. 'This shade holder is provided with ordinary set screws E for engaging and holding the shade. A switch bracket F containing the ordinary Snap switch G is mounted between the insulating disks H, H and the switch stem I Specification of Letters Patent.

Application filed February 20, 1909.

Patented July 6, 1909.

Serial No. 479,149.

is connected with a key J by means of a scnew K connected with the key and extending through an aperture in the casing A into a screw threaded socket in the stem 1.

The parts G, H, H, J I, and K may all be of any ordinary construction, except that the upper insulating disk H is provided with notches I) on opposite sides thereof, the casing A being rovided with stud pins N adapted to enter t ese notches and hold the switch frame .in position with the stem I registering with an aperture K in the casing A, whereb the key J may be readily attached or removed.

0 is a non-conducting lining for the casing A and the key J is provided with a non-conducting annulus P, whichenters the aperture K in the casing and prevents any metallic contact between the screw K and the wall of the casing A. The switch frame is provided with an ordinary cup-shaped screw threaded member (i, which constitutes the socket proper into w rich the lamp is screwed, but between this member Q and the lower margin of the casing A, I have provided a removable bushing R composed of insulating material and having its exterior surface threaded to engage the screw threads (1 within the casing This bushing extends upwardly beyond the bead a and engages the under surface of the disk H, thus sup orting the switch frame and socket member independently of the key and screw K.

With this construction, it is obvious that the switch frame and socket member Q may be readily removed by unscrewing the key J and bushing R without disturbing the shade. On replacing the switch frame, the studs N compel an adjustment of the frame in the proper )osition to permit screw K to reenter the soc et in the end of the switch stem I.

The shell being in one piece, it is obvious thatthere is no danger that any of the arts will become accidentally disconnected. he bead a serves as a stop for the shade holder E, which not only limits the upward movement of this holder, when it is being screwed into )lacc, but also causes the shade holder to bind upon the screw threads and looks it in position.

Having thus described my invention, what I claim as new, and desire to secure by Letters Patent is- 1. In a device of the described, class, the combination with a switch frame and lamp socket, of an integrally formed casing having an open lower end portion creased to form internal and external screw threads, a shade holder exteriorly engaging said threads and a non-conducting bushing interiorly engaging said threads and supporting'the switch mechanism.

2. In a device of the described class, the combination with the switch mechanism, of an integrally formed casing adapted to receive said mechanism and provided at its lower end with means for supporting a shade holder from its exterior surface and the switch mechanism from its interior surface.

3. In a device of the described class, the

combination with the switch mechanism, of an integrally formed casing adapted to receive said mechanism and provlded at its lower end with means for supporting a shade WILLIA1\I G. LINDEB TANN.

Witnesses:

JOHN H. BROOK, CHARLES KLENK. 

